After replacing Sandro Rosell at Barcelona, the new president insisted he will continue to defend the club over the Brazilian's controversial transfer from Santos.
Rosell's resignation was confirmed at a press conference on Thursday, with former vice president Bartomeu confirmed as the new club chief until the end of the 2015-16 season.
"We are going to be very strict in the defense of our club against all the judicial and sporting authorities," the new president told reporters.
On taking over the running of the club, Bartomeu pointed to the upcoming referendum over the club's development of Camp Nou as a crucial area of focus in the coming months.
The new president continued: "I want to encourage the socios to continue supporting us in future. All of our challenges are as valid as ever. The future of the Camp Nou remains a priority - and we are playing for our future over the next few months."